Hydraulic jack



P 2, 1952 T. A. CHEESMAN 2,608,825

HYDRAULIC JACK Filed Sept. 22, 1947 IN V EN TOR.

a K I THEODORE A CHEESMAN 3 4 5 ATTORNEY Patented Sept. 2, 1952 I UNITED STATES PATENT l OFFICE v DRAULIC men I l Theodore A. Cheesman KaIama, Wash. Application September 22, 1947, Serial No. 775,522

2 Claims.

. r 1 K I This invention relates to pumping mechanismfor hydraulic cylinders and is particularly adapted to jacks, presses and pullers.

The primary object of the invention is to provide an oil reservoir that will be maintained in an upright position so that the oil can be pumped out of the same without encountering air pockets.

Heretofore pumping mechanisms have been incorporated including their reservoir within the hydraulic assembly in a flxed relative position and when the hydraulic assembly was inverted or otherwise held at an angle, air was taken into the suction line due to the position of the suction pipe relative to the oil level within the reservoir, but with my new and improved reservoir the same is'suspended on a flexible hose so that the reservoir and the suction line will be maintained in a vertical position so that the suction end of the hose is always under the oil level.

These and other incidental objects will be apparent in the drawing, specification and claims.

Referring to the drawing:

Figure l is a side elevation of a typical hydraulic jack having my new and'impro'ved reservoir attached thereto, parts broken away for convenience of illustration.

Figure 2 is an enlarged fragmentary plancross sectional view of the jack taken on line 2-2 of Figure 1.

Figure 3 is a sectional view taken on line 33 of Figure 1, parts broken away for convenience of illustration.

Figure 4 is a further illustration of the jack being used as a puller. This view demonstrates that the reservoir unit is' always in a vertical position regardless of the position of the jack.

My-new and improved portable hydraulic jack comprises a working cylinder I having an open end that is closed by a cap nut or plug la. A pump cylinder 2a of the pump mechanism 2 is formed integral with the outer Wall of the cylinder I with the longitudinal axis of the mechanism in parallel relation to the longitudinal axis of the working cylinder. A transversely or laterally extending valve chamber 3 is formed on the lower end of the pump cylinder 2a integral therewith and with the outer wall of the cylinder I. Positioned in one end of the chamber 3 is the spring biased inwardly opening inlet valve 4 which is retained in its proper position by means of the set screw 4a. Connected to one end of the chamber 3 and communicating therewith is the flexible supply line 5 which at its opposite end is connected to the reservoir 6. The opposite end of the chamber 3 is closed by a cap nut or plu 2 v v a .7 3a and inwardly of the plug 3a is the spring biased outlet valve I; An inlet port 8 providescome munication between the cylinder l and the chameher 3 and is controlled by means of the valve I. It will be understood that the valves 4. and I are accessible through the plug 3:1 for the removal or insertion thereof as is necessary for repair purposes. i V

Mounted for reciprocal operation within .cthe cylinder I is the plunger or ram 9 which is oper ated by hydraulic fluid [4. A stufiing box I0 at the closed end of the cylinder l'cooperates with the ram 9 to prevent leakage of the hydraulic fluid from the cylinder I. The rain 9 is'provided at one end with a tool receiving socket or bore II which receives a tool I2 therein; It being understood that other tools than the one disclosed are susceptible of being inserted into the socket II.

The flexible supply line 5 has an extension 13 at the end connected to thereservoir 6 which extends through the top of the reservoir :6 down through the fluid I4 to a pointslightly spaced from the bottom of the reservoir 6 to provide a clearance I5 'for the passage of thefluid I4 into the extension [3 (Fig. 1). A removable plug ea in the top of the reservoir 6 permits the replene ishing: of the fluid I4 as is found necessary.

A bleeder valve I6 closes or opens the bleeder port I? which is closed at the outside bya plug Ila. The port II leads from the inlet end of chamber- 3 outwardly Of the check'valve 4 between the latter and the supply line 5. The valve [6 being normally closed and opened when it is desired to allow the fluid I4 to drain from-the cylinder I back into the reservoir 6, the operation of which I will more fully describe later.

Pivotally connected to the outer wall of -the cylinder I at one end by means of the pivot pin 20a is a link 20. The opposite end of the link 20 is pivotally connected at I9 to one end of a handle l8 which is pivotally connected at 22 to the bifur cated end 2 la of a plunger or piston 2i. The piston 2| being reciprocally mounted in the pump cylinder 2a of the pump mechanism 2.

Formed integral with the outer wall of the cylinder I on opposite sides thereof on a line below the pump cylinder 2a are the pair of parallel cross arms 26 the ends of which extend in opposed parallel relation to each other in opposite directions from the cylinder 1. Each of the cross arms 26 is provided with a plurality of relatively spaced openings 21a which extend from the ends of each arm to the merging of the cross arms 26 with the cylinder l.

I will now describe the operation of my new and improved hydraulic jack. When it is desired to operate the plunger or ram 9 within the cylinder I the pump handle I8 is operated in a conventional pumping action. Movement of the handle l8 will reciprocate the piston 2!. When the handle I8 and piston 2| are raised the check valve 4 is opened by reason of the suction created in pump cylinder in. This suction will draw the fluid'l4 into the pipe [3 through the space I and the fluid [4 will" travel throughthe flexible tube 5 into the valve chamber 3. When the handle 18 is pressed downwardly the inlet valve 4 will be closed and the outlet valve 7 will be opened allowing the fluid 14 to be forced through the inlet port 8 into the cylinder I extending the ram 9. The extension of the T311119 depending on the number of times the handle [8 is raised or lowered.

When it is desired to release the fluid from the cylinder 1 thevalve I6 is opened allowing the fluid to drain through the port [7 back into the fieidble supply line .5 and to return to the reservoir fi.

InFig. 1 my hydraulic jack is disposed vertically and is used as a raising device wherein the tool 12 is placed on the fixed support 30..so that the object 31 may be raised as desired.

. IniFig. 4 my hydraulic jack is disposed horizontally and is being used as a puller. In this position the tool 12 contacts the end 23 of a shaft 24. Pulling hooks 2.5 are bolted to the cross arms 26 intermediate thereof by means of bolts 2'! passing through the spaced openings 27a in both arms. The ends 28 of the hooks 25 engage the element'29 which is desired to be removed from the shaft 24. Regardless of the manner of use of the jack, the-operation of the jack is as previously described.

It makes no difference whether the jack is being operated in a vertical position as in Fig. 1 or ahorizontal position as in Fig. 4 the position of the oil reservoir 6 is always vertical and this is the primary object of my invention. However, I do not wish to be limited to the illustration of Figs. 1 and 4 as it may be adapted to many other positions and operations.

It is also to be understood that certain changes in the mechanical details may be made provided they fall within the scope of the appended claims.

What I claim is:

1. A portable hydraulic jack comprising in combination a working cylinder, a ram reciprocable insaid working cylinder, a pump cylinder formed integral with the outer wall of the working cylinder, a valve chamber integral with the outer wall of the working cylinder and extending laterallyof the pump cylinder, at the lower end thereof, a communicating passage between said working cylinder and said pump cyiinder by way of said valve chamber, a pump piston in said pump cylinder, a normally closed spring biased inlet pump valve in one end of said valve chamend of the valve chamber, a bleeder port in said working cylinder forming a communicating passage between the working cylinder and the valve chamber outwardly of the inlet pump valve, an independent portable reservoir free of the work- .ing cylinder, and a flexible connection between said reservoir and the inlet end of said valve chamber whereby said reservoir may be retained in a vertical position regardless of the position of said working cylinder.

2. A hydraulic jack comprising a workingcylinder, a plunger movable in said working cylinder and extending through a packing at one end thereof, a pump cylinder lengthwise on and between the ends of the working cylinder, a valve chamber at and communicating with one end of the pump cylinder, a piston operable in the pump cylinder, said valve chamber having an inlet at one end and an outlet at the other end communicating with the working cylinder between its ends, an inlet valve in the inlet opening into the chamber, an outlet valve at and opening toward the outlet, said pump communicating with said valve chamber being located between, said inlet and outlet valves, a valved bleeder port between the inlet outwardly of the valve therein and the end of the working cylinder adjacent the inlet end of said valve chamber, a portable reservoir independent of the cylinders, and a flexible tube extending between the reservoir near itsbottom and the inlet.

' THEODORE A. CHEESMAN.

REFERENCES CITED The following references are of record file of this patent:

UNITED STATES PATENTS in the Liddell et a1. Aug. 22,1939 

